Took a look at the greatsword sprue at GW's website, it seems like you get 9x2 torsos per box. Is this true or is the torso two-part, and if so, why cant I find the tenth torsobit?

Also, it seems like you get 10x2 Greatsword arms(right) and only 7x2 left arms(that go with the greatsword)?

And 15x2 heads?